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18a. River's to silence mostly after loudness (5)
V?l?a.
Volta or Volga, can't justify either.

25a. Odd old oil cans thrown around roughly (10)
?c?a?i?n?l
Must be occasional, but why?

Volga, vol + ga(g)
Old = o + anagram of "oil cans" round"ca" = roughly.